Clutch



E. W. GARDINOR' ETAL April 7, 1953 CLUTCH 5 Sheets-Swat mm Jan. 19. 1950 ttomeg JOHNSON J. LAMB CURT l. EUGENE April 7, 1953 E. w. GARDINOR ET AL 2,633,957

CLUTCH I Filed Jan. 19, 1950 5 Sheets-Sfis et 2 3 no I N I 31mm ELLIOTT w. GARDIN CUR'IT JOHNSON g EUGENE J. LAMB i April 7, 1953 I E. w. GARDINOR ET AL 2,633,957

CLUTCH Fil ed Jan. 19. 1950 5 Sheets-Sheet :5

ELLIOTT w e li'i'dl'fi'oa :65 CURT l. JOHNSON 47 EUGENE J. LAMB He. 6. l W

April 1953 E. w. GARDINOR ET AL 2,633,957

CLUTCH Filed Jan. 19, 1950 5 Sheets-Sheet 4 Zinnentor: ELLIOTT W GARDINOR CURT I. JOHNSON EUGENE J. LAMB Apnl 7, 1953 E. w. GARDINOR ET AL 2,633,957

CLUTCH Filed Jan. 19 1950 s Sheets-Sheet 5 STOP INIWLiL NLOC D LAT H LOC CAM UNLOCKED 000 0000000000000 $ssam222$9 3mm ELLIOTT w. GARDINOR W CURT I. JOHNSON 39, EUGENE J. LAMP s www 2 an meg Patented Apr. 7, 1953 CLUTCH Elliott W. Gardinor, Conklin, and Curt 1. Johnson and Eugene J. Lamb, Vestal, N. 2., assignors' to International Business Machines Corporation, New York, N. Y., a corporation of New York Application January 19, 1950, Serial No. 139,418

16 Claims. 1

This invention relates to a clutch mechanism forfstarting and stopping'a load in a shock-free manner.

A particular object is to provide a clutch mechanism capable of starting a load device smoothly from a stationary to a running condi tion and of clutching it to a driving mechanism in a predetermined angular relation.

Another object is to provide a clutch mechanism between a power shaft and a load shaft which can declutch the load shaft and'bring it smoothly to a predetermined stopped position. Another object of the invention is to provide for accelerating a load shaft smoothly from a fixed starting position to full angular velocity and for decelerating the load shaft smoothly from full angular velocity to the-fixed star-ting position and for transferring control of th load shaft to and from a constantly running power shaft between acceleration and deceleration.

Another object is to provide a device as described in the preceding paragraph, including means to insure'the' clutching of the load shaft to the power shaft in a predetermined angular position.

A preferred embodiment of the invention is a clutch mechanism for intermittently coupling a printing unit to a constantly running tabulating machine drive. For one type of operation of a printing tabulator. known as non-listing operation,'the printer is normally idle and is set in operation only intermittently, fora total print cycle at the end of each card group and for a group indicate cycle at the beginning of the next card group. Since the card groups'may contain any number of cards the print clutch must be controlled automatically from the cards. also, since the printer must run in a predetermined angular relation to the tabulator drive mechanism, the print clutch must'be of a type which can become engaged in only one angular relation to the tabulator drive mechanism. Her'etofore the clutching means has consisted of a dog on the printer driven shaft and a continuously running single-notch disk on the t'abulator drive, which picks up the dog instantaneously from a stationary position. Also, the printer mechanism must be stopped in a predetermined position and is allowed to coast to the stopping position with enough speed to insure that it will not stop before reaching this position. Such a clutch is not free from shock in starting and stepping.

Accordingly, it is a particular object of the invention to provide a clutching mechanism for 2 a printing tabulator characterized by low shock in starting and stopping.

It is also a particular object of the invention to provide a clutching mechanism of the kind described in the paragraph above, which can be controlled for both starting and stopping by a uniformly timed impulse, which will be recognized as a start impulse or a stop impulse, depending upon whether the printer is idle or runmng.

Other objects of the invention will be pointed out in the following description and claims and illustrated in the accompanying drawings, which disclose, by way of example, the principle of the invention and the best mode, which has been contemplated, of applying that principle.

In the drawings:

Fig. 1 is a sectional side view of taken on line t-l of Fig. 5.

Fig. 2 is a view taken on-line 2-2 of Fig. 5 showing the drive mechanism for the load shaft.

Fig. 3 is a perspective view of the device.

Fig. 4 is a sectional view taken on line 44 of Fig. 2.

Fig. 5 is a plan view of the device.

Fig. 6 is a sectional view taken on line 6-6 of' Fig. 1.

Fig. 7 is a sectional view taken on line 1-4 of Fig. 5, showing the par-tsin a different positionfrom that of Fig. 1.

Fig. 8 is a view similar to Fig. 2 showing the drive mechanism disengaged from the load shaft.

Fig. 91s a timing diagram.

The illustrativ example shown in the drawings is a clutch mechanism adapted for driving the print unit of a printing tabulator. The power mechanism to which the print unit is to be clutched includes a power shaft l0 (Fig. 5) to which power is continuously applied by means of a gear [I fixed on an input drive shaft l2 and meshing at right angle with a gear [3 fixed on said power shaft ID. The input drive shaft I2 may be driven from an electric motor or other suitable source of power and may be, for example, the shaft ll of the patent to Robert EL Paris, No. 2,398,036. A load shaft 14 mounted co'axially with the power shaft ID has a driven arm 15 (Fig. 2) keyed at its end, whichpivotally supports a dog IS. The hooked end 11 of the dog [6 is adapted to engage in a notch 5 of a flange l9, fixed on the end of said power shaft In, for the purpose of driving said load shaft [4. In the idle condition of the load shaft M the dog It and the driven arm iii are both latched by a latch 20, so that said dog I6 is held out of the notch the device 5 in the continuously rotating flange I9. A spring 2| stretched between a pin 22 on the dog l6 and a pin 23 on a cam member 24 pivoted to the driven arm [5 tends to rock the dog 83 and the cam member 24 counter-clockwise on the arm I5. When the latch 29 is lifted, in a manner to be described, the dog I6 can rock into engagement with the flange l9. The notch 5 catches up to the hooked end 11, which drops into the notch and at this time the cam member 24 rocks to lock the dog It in said notch 5. The load shaft 14 will then turn continuously at the same rate as the power shaft In.

In accordance with the invention means are provided to accelerate the load shaft l4 prior to engagement of the dog It in the notch 5, so that at the time this engagement occurs the load shaft l4 will be turning at the same rate as the power shaft I9. For this purpose there is mounted on the load shaft !4 a Geneva arm 25 (Fig. 1) having an open ended radial slot 25. 'The Geneva arm 25 is revolvably mounted on said load shaft H, but has pivoted thereto a dog 21 which normally engages behind a shoulder 28a on a disk 28keyed to the load shaft. A spring 23 is connected to a pin 30 on the Geneva arm 25 and anchored at its other end to a pin 3| on a member 32, said member 32 being an integral part of a sleeve 33, loosely mounted on the load shaft l4. The opposite end of sleeve 33 has fixed thereto a cam member 34 as shown in Fig. 3. The Geneva arm 25 has a large hole 35 through which extends a pin 3?. This pin 31 engages a slanting slot 36 in the member 32 and as said member 32 is urged in a counter-clockwise direction by the action of the spring 29, the oblique side of the slot 36 will pivot the dog 27 clockwise against the disk 28. Another spring 38 hooked over said pin 39 on the Geneva arm 25 and anchored at its other end to a pin 39 in the side plate 45 tends to rock the Geneva arm 25 in a clockwise direction against a stop 4|.

A counter shaft 42 (Fig. 5) is driven from the power shaft H! at half the speed of said power shaft by a gear 43 pinned to said power shaft meshing with a gear 44 pinned to said counter shaft. Fixed to the counter shaft 42 is a ratchet disk 45 (Fig. '7) which rotates clockwise continuously at half the speed of the power shaft. A drive arm 43 (Fig. l) is revolvably mounted on the counter shaft 42 and has pivoted thereto a dog 47 with a hooked end adapted to engage any one of four teeth 2, 3, or 4, on said'ratchet disk 45, as determined by control means to be described later. The dog 4! has a slotted arm in which engages a pin 49 on a spider 49, which is also revolvably mounted on the counter shaft 42 and is connected to the drive arm 43 by a spring 59 stretched between a pin 5! on the drive arm and a pin 52 on the spider. The force of the spring 59 tends to rock the spider 49 clockwise, to urge the dog 4! into engagement with the ratchet disk 45. A latch 53 fixed to a shaft 54 journaled in a bearing of the side wall 4!] has a hooked end which normally latches a finger of the drive arm 43 and a finger of the spider 49. When so latched the spider 43 moves back against the force of the spring 59 to retract the dog 41 from the ratchet disk 45.

The latch 53 is operated by an electromagnet 59 (Figs. 1 and 3) acting upon an armature 99 fastened to the rear end of shaft 54. A tabulating machine of the type for which the illustrative clutch mechanism is designed is provided with cam operated contacts, such as the contacts CR2,

4 etc., of the patent to John R. Peirce, No. 2,042,324. One of these contacts can be used as a source of impulses for the electromagnet 89. The cam operated contacts determine the time in the cycle during which the impulse is to be transmitted and other contacts controlled by the card reading means determine whether the impulse will get through to the magnet 39 in any particular cycle.

The latch is restrained against releasing movement except during a brief portion of the cycle while the magnet is being energized. For this purpose there is mounted on the shaft 42 a disk 92 on which rides a roller on a follower lever 9|. This lever is pivoted on the stationary shaft 68 and has an arm extending downward to the right with a forked end embracing a stud 93 on a lever 94. The lever 94 is pivoted by a stud 95 to the latch 53. Since the bottom end of the lever 94 rests against the end of one of the fingers of the spider, such as 59, when the roller on lever 9| is on a high part of the cam 92 the stud 95, and therefore the latch 53, are held in by a third class lever action.

The drive arm 43 and spider 49 have four fingers each. For an accelerating operation the drive arm and spider are released by a movement to the right of the latch 53. As said latch 53 is tripped, the spider 49 will rotate clockwise slightly due to the action of the spring 59 thereby causing the dog 47 to pivot clockwise against the periphery of the ratchet disk in front of the tooth I (Fig. 1)

It is to be noted that the fingers on the spider 49 are slightly longer than the fingers on the drive arm 45 so that as the spider rotate slightly clockwise a finger on the spider will prevent the latch 53 from returning to its latching position until after the dog. 4! has engaged a tooth on the ratchet disk 45 and the drive arm 46 has rotated clockwise past the latch 53. The latch 53 will return in time to latch the fingers 55 and 55 of the spider and drive arm, respectively, disengaging the dog 41, after 55 of rotation of the drive arm. For a decelerating operation the latch 53 is again rocked to the right, the dog 47 engages with a tooth 4 on the ratchet disk, and the drive arm and spider rotate 125, at the end of which movement, the latch 53 having returned to the left, the fingers 58 and 59 are engaged by it and the dog 41 is disengaged from the ratchet disk.- The same operations are repeated for a second accelerating and decelerating operation, the drive arm 46 and spider 49 being successively latched.

by the fingers 3B and Si and the fingers 62 and 63.

The teeth 2 and 3 coact with the dog 41 in the. same way as the teeth I and 4, respectively, de.

pending upon the relative position of the dog 4! and disk 45 when the impulse to magnet 83 arrives.

The complete operation of the clutch will now be described, with reference to the timing chart, Fig. 9. In Fig. 1 the parts are shown just as the roller of the follower 9! is about to ride into a notch 96 and release the latch 53 to the control of the electromagnet 89, namely, at about machine time. In the diagram the abscissa represent cycle time and the ordinates represent angular position, zero position being on the line of centers of the shafts l4 and 42, at the right side of each shaft. The latching surface of the latch 53 is at 0.

If the magnet 89 receives an impulse at 110 in the first cycle shown in Fig. 9, the latch 53 will acaaew and V80. (#0,. representing the. movements. of

61-. fixed to thel-atch armizll. An extension 89 at said side. plate 56 has an arm H to which is attached. a spring 12 the other end of which. is

anchored. tov an arm l3- of. the latch 53.. The

spring 12 rocksthe. bracket '61 sov that another armfm thereofinormally rests against a stud 54, When side plate 66 is cammed upward, latch 20 is lifted, .releasingthe driven arml5 and. dog it The movement of the latch 53 to. the right. is

timed-s that thehooked. endiof. the dog [6 drops onto the periphery. o1 thefiange [9 in advance of the notch It is the function ot the acceler- 'atlng mechanism to. accelerate the driven arm T5 at sucha rate thatwhen the notch 5 reaches the. hookedend. [T of the dog, said dog will. be traveling counter-clockwiseat the same rate as thenotched flange l9.-

Mounted 180 apart onthe' drive arm lflfiare two driving elements the form of rollers Ht. Therollers "are positioned. to enter the slot 26 of the Geneva armlii The one standing, in front of'the slot at the beginning ct a clutchs engagingcyoleenters the slotshortlyaiter the drive armAebegins. torotate; namely at about- 220 machine time, This occurs after the latch 2 0'. has been lifted and the driven; arm: released. As said roller 14 movesradially the slot 26 it accelerate-stile Genevaarm. 25 see curve Geneva For" inEigsQl; Itshould be noted thatthe distance between the axis of the roller "and the axis. oi the. counter shaft is slightly greater than two thirds the distance between the axes: of the shaits 42 and. L In other words; the distance between the axis of rollerl l and the" axis. of 1 counter shaft 42 is slightly greater than twice. the: distance between the. axis oi'thetroller T4 and'the. axis ot-the power? shaft It; When. the roller. 14 arrives at the line of centers" between the power shaft l0 and the counter shait t2; Therefore, when the-roller axis reaches: a posl;- tion Justin front oi theline orccnters, (5 in front-eli it intheprcsentcasel thecl'eneva arm 25 and the driven arm l5 are rotating at the same rate as the power Shaft because the counter shaft i 42 i's turningat-half thespeedv oithe" power shaft 10.

Theti-mlng oi the mechanlsmszis: such? that. at this. moment; namely, about 302' machine" time;

the notch 5 ,in thetflange la comesunder the hooked endol': the-dog I-Gand allows the (logic drop into the notch; with the'parts'in a substam tially stationary relative" condition. Notch numher 5 is-approximatelyl74 from zero'position, as" shown by the linevltc can Fig. At this moment the-"drive arnr 46' is stopped at finger '56 byft'he. latch: 51?; the spider 4 9" having been stopped -.j-ust previously-by its finger '55 and. the dog- ALQd-fsengaged. This position of the arts is shownih Fig.

Meanwhile; shortly before the drive arm. 46 was-stopped, apin T5 on. the Spider? moved in front of the nose on cam 34 and. when the spider 49 was stopped by the latch 53 the cam Stand member 32 were held stationary, while the Immediately one of two pins Geneva arm 25 continued its movement andthe dog, 21 was-icammed out of. engagementwith notched disk Ml.- Thus; when the Geneva. arm.

is stopped. by the latching of the drive arm 46 the dog, 21 is clear of the disc 28 and the load shaft 14 is free to rotate with the power shaft 10;- The Geneva arm 25 is held by the'roller 14 ot the drive arm 46 which islatchedby the latch. 53 in the position where theaxis of the. roller It is just: 5'- inadvance oi the line of centers. be-' tween the power shalt H) and the counter shaft- 42. A keeper l6. pivotally attached to the latch arm 53 is urged to pivot clockwise against a stud H on the latch 53 by means of a spring It,

stretched betweensai'd stud 11 and apinr 19 on:

the" keeper; When the finger. 58 brushes past the keeper l6 into latching position; a flange 98 on. thekeep'ei" springsbehindthe end of fingerv 55 and serves-"to hold the drive arm. 46 against the force of spring. 38.

Just before therGeneva drive arm. 46- is latched up, a lug lfll on spider 49 engages under a side" tripping oi" the latch 53, the Geneva arm 25. rotated approximately 55 during which time theload shaft M- (referred to as printer load on said timing diagram) was" accelerated until ithad reached the same rate of-speed as the power shaft It. At the endiof this 55 of rotation the Geneva-arm 25 is stopped and the load shaft and power shaft continue to rotate at thesame speed,

The-tim-ing diagram shows anotherimpulseoccurring the next machine cycle, which will have the function of a stop impulse.

latch 53; the latch is again moved to therl'ght; allowing the spider to jump ahead far enough to move the lug l cl from under the side plate Mia. This allows the latch 2!?- to drop to its lower position; The movement of the'pln. 15' when-the spider is released also allows the unit --34, 33, 32 to movecounter-clockwise, under the pull of spring 29-, and earnthe dog 21' against the diskl z't. The disk is rotating counter-clockwl'se: and the dog'strikesitsome dist'ance'in ad: vance of the notch 36. when the spider is released the dog 41 stands at" about 145' and, when moved bythe spider 49, engages the disk" 45- well in advance of tooth #4, as" shown byline V88 (#47 in: Fig. 9. The dog is picked up by tooth. we at approximately 217' machine time.

shortly after thedog 21 has dropped into the" notch all ofdisk 28. The notch all is somewhat wider than the nose of the dog" 28', to provide good clearance; assuring. that the dog is in the notch before the Geneva arm-starts to il l'ove.

The Geneva arm 25 begins to move at a high rate, because the roller M is almost at its nearest aproacl'i tothe axis ot the power shaft "1;. I andmoves forv a short time at an accelerated rate, until the axis of the roller passes the: line of centers between the power shaft I 0 and-the counter shait 42:. This accelerated movement of the Geneva arm causes the dog 2'! to catch up to the forward shoulder of the notch on disk 2-8; in positionto. apply a. continued. force thereto, which will drive the load shaft M to:

When the notch 9'5 in the latch lock cam releases the th'e'normal latching position. The do 2! strikes the forward shoulder of the notch 80 a little before its angular velocity has been reduced to that of the load shaft M, whereby it accelerates the load shaft slightly and frees the nose I! of dog l6 in the notch 5.

Meanwhile a nose 8| on cam member 24 has struck the hooked end of the latch 20, rocking the'cam 24 clockwise. The rocking of the cam 24 causes its arm 82 to engage a face 83 on the dog [6 and to disengage the dog I6 from the notch [8 in the power flange I 9. This occurs at the moment when the nose I! of dog It has been freed in notch and the disengagement of the dog occurs without frictional hindrance. From this time on the movement of the load mechanism to the latched position under its momentum is assisted and insured by the Geneva arm' 25. Also, if the load shaft tends tooverrun the decelerating Geneva arm, it is held back by the action of the dog 21 against the rear end of notch ;8l.l.

When the arm 82 of the cam 24 completes the disengagement of the dog IE it hooks under the shoulder 83' on the dog and. latches the same out of engagement with the notched flange 19 (see Fig. 8). The nose ill of the cam travels on past the hook of the latch 26. Soon afterward the nose 8 4 of the dog it strikes the hook of the latch 20, rocking the dog clockwise and releasing the cam 24. Finally the nose 85 of the driven arm 15 strikes the latch 2e, and a keeper 86, urged counter-clockwise about a pivot stud 87 Ma spring 88, drops behind the nose 85 to latch the load mechanism in its idle position.

.The latching of the load mechanism occurs just as the Geneva arm 25 is approaching the limit of its movement and is therefore traveling slowly. The final latching of the load mechanism is consequently relatively free from shock.

When the roller 14 rides out of the slot 25, the Geneva arm remains in an elevated position held against the pull of sprin 38 by the abutment of the dog 2! against the rear end of slot80. To release the dog and allow the Geneva arm to return to its lower position the pin 65 on the driving arm 46 is arranged to strike the tail of dog 21 and lift the dog from notch 80. As the driving arm continues its rotation the pin 65, which is traveling along the lower edge of the arm-25 and the dog 21, comes to a beveled surface of the arm 25, which allows the arm to drop while the dog is held released. The arm drops far enough to bring the nose of dog 2'! past the rear shoulder of notch 80, then the tail end of the dog drops oif of the pin 65. Finally the pin clears the end of the arm 25, which drops against the abutment M. The dog Z'l'drops behind the shoulder 28a, in readiness for the next acceleration. The driving arm 46 and spider 49 continue their rotation until they latch upin the manner previously described.

'From the time the lug lill passes the line of centers betweenthe shafts 42 and 68 it acts against an arcuate tail of the side plate 66a, to prevent the latch 26 from tilting up. Thereby it insures effective coaction of the nose 8! and the hooked end of latch 26. When the spider 49 is latched the lug [0| remains behind the tail of side'plate 65a, to prevent the latch 20 from being accidentally released before the primary latch 53'is released.

While there have been shown and described and pointed out the fundamental novel features of the invention as applied to a single modification, it will be understood that various omis sions and substitutions and changes in the form and details of the device illustrated and in its operation may be made by those skilled in the art without departing from the spirit of the arm approximately between'said movements, and

means to clutch said load member alternately to said Geneva arm and to said power member.

2. In a clutch mechanism, a rotary power member, a rotary load member coaxial therewith, a Geneva arm pivoted to rotate about the axis .of said power member and'having an open ended radial slot, a driving arm rotatable on an axis parallel to the axis of said power member and having a driving element adapted to enter the slot of said Geneva arm, means to rotate said driving arm about its axis through an angle such as to cause said driving element to enter said Geneva arm slot and to move with said Geneva arm to the vicinity of the plane including said parallel axes, means to stop said driving arm and said Geneva arm at the end of said movement, means to clutch said load member to said Geneva. arm during the movement of the latter by said driving element, means to clutch said load member directly to said power member at the end of said movement of the Geneva arm, and means to declutch said load member from said Geneva arm at the end of the movement of the latter.

3. In a clutch device, a constantly rotating power member, a rotary load member coaxial therewith, a-Geneva arm mounted to rotate about the common axis of said members, means to clutch said load member to said Geneva arm, means to impart an accelerating movement to said Geneva arm and thereby to said load member, means to stop said Geneva arm when said load member reaches the same rate of speed as said power member, means'to clutch said load member to said power member 'at the time said Geneva arm is stopped, and means to declutch said load member from said Geneva arm at the time the latter is stopped.

4. In a clutch mechanism, a rotary power mem: ber, a rotary load member coaxial therewith, a Geneva arm pivoted to rotate about the axis of said power member and having an open ended radial slot, means to clutch said load member to said Geneva arm, a shaft having an axis which is parallel to the axis of said power member, means for rotating said power member, means for rotating said shaft at half member, a driving arm mounted on said shaft and having a driving element adapted to enter the slot of said Geneva arm, the distance from said driving element to the axis of said shaft being at least two thirds of the distance between the axes of said shaft and said power member, means to clutch said driving arm to said shaft, whereby said driving element enters said slot and moves said Geneva arm at an accelerating angular velocity, means to stop said Geneva arm when said load member reaches the same rate of speed as said power member, means to clutch said load member to said power member at the time said Geneva the speed of said power aerate "arm is stopped, and means todeclutch load member from said Geneva arm at the time the latter is stopped.

5. In a clutch device, a constantly rotating powermember having a notched flange mounted thereon, a rotary load member coaxial therewith and having a driven arm attached thereto, a dog fixed to said driven arm, a latch normally latching said dog and said driven arm, a Geneva arm pivoted to rotate about the axis of said power member and having an open ended radial slot, a notched disk fixed to said load member, a second dog pivoted on said Geneva arm and normally engaging a notch of said notched disk, a shaft having an axis parallel to the axis of said power member, means for rotating said power member and said shaft, a driving arm'revolvably mounted on saidshaft and having a driving element adapted toenter the slot of said Geneva arm, means to clutch said driving arm to said shaft, whereby said driving element enters said slot and moves said Geneva arm at an accelerating angular velocity, a pin mounted on said driving arm and adapted to unlatchsaid first named dog and drivenarm just prior to said accelerating movement,

a latch adapted to stop said driving arm and thereby said Geneva arm when said load member reaches the same rate of speed as said power member, the timing being such that said first named dog engages a notch of said notched flange at the time said Genevaarm is stopped, and a cam member adapted to disengage said second dog from the notchof said disk at the time that said Geneva arm is stopped,-

6. A clutch device as in claim wherein the means to clutch said drivingarm to said shaft includes a dog pivoted to said driving arm and having a diagonally slot-ted arm, a spid v ably mounted on said shaft and having a pin adapted to engage in the slot of said slotted arm, a spring connected between said spider and Said driving arm tending to rock said spider against said latch, a ratchet disk "fixed to said shaft, and means to release said latch from said spider and driving arm, thereby enabling said pivoted spider to jump ahead of said driving arm, under the influence of said spring, and rock the dog pivoted to said driving arm into engagement with said ratchet disk.

7. In a clutch device, a constantly rotating power member, a rotary load member coaxial therewith, a Geneva arm pivoted to rotate about the axis of said power member and having an open ended radial slot, a driving arm rotatable on an axis parallel to the axis of said power member and having a driving element adapted to enter the slot of said Geneva arm, means to rotate said driving arm, whereby said driving element enters said slot and moves said Geneva arm at an accelerating rate, means to stop said driving arm and, said Geneva arm at the end of said movement, means to clutch said load member to said Geneva arm during the movement of the latter by said driving element, means to clutch said load member directly to said power member at the end of said movement of the Geneva arm, means to again rotate said driving arm, whereby said driving element moves said Geneva arm at a decelerating rate, and means to declutch said load member from said power member during said decelerating movement.

8. In a clutch mechanism of the class described, a constantly rotating shaft, a, rotary driving arm revolvably mounted on said shaft, a spider revolvably mounted on said shaft, a dog pivota'lly mounted on said I d iving arm, said spi er ha g n a ith a pin extendin he fr m' ngased in a slot insaid d g, a ma ne n armat e for said m net having an arm with a hooked end normally extending in the path of said driving arm and the arm of said spider, a spring connected between said spider and said driving member tending to rock said spi r in t e direction to cam said do toward said shaft an to position the arm f said spide slightly ahead of said driving arm, a toothed di fixed n aid aft, said magnet, when imi j being adapt d to pivot said armature out of sag m ntwith said driving arm and the arm of said spider whereby said'spider will rotate and said dog will pivot into engagement Wi h One of Said teeth on said disk to drive said driving arm, and cam controlled means for suppressing the Operation of said armature during certain portions of the clutch cycle.

9 m a clutch mechanism or the class described, a constantly rotating powermember, a rotary load member coaxial therewith, a notched flan e fixed to said power member, a driven arm keyed to said load member, a dog pivoted to said driven arm and spring biased toward said notched flange, a latch member normally latching. aid dog and said driven arm, whereby said dog is held out of enga em nt with said notche flange, a Geneva arm pivoted to rotate about the XiS of said power member and having an Ope ended radial slot, .a shaft having an axis parallel to the axis of said power member, means for rotating said shaft, a driving arm revolvably mounted on said shaft and having a driving element adapted to enter the slot of said Geneva arm, means to clutch said load member to said Geneva arm, means to clutch said driving :arm to said shaft whereby said driving element moves said Geneva arm and hence said load member, a bracket fastened to said latch memher, and a pin mounted on said driving arm adapted to engage said bracket to raise said latch member releasing said dog and driven arm.

10. A clutch as described in claim 9, wherein said means to clutch said driving arm to said shaft comprises a spider revolvably mounted on said shaft and having a limited movement in relation to said driving arm, a spring tending to move said spider in one direction in relation to said driving arm, another latch member adapted to latch said driving arm and said spider and thereby to move said spider back against the force of said spring, and an ear on said spider coacting with said bracket in one latched position of said spider to hold said first mentioned latch member out of the path of said dog and said driven arm, said ear being moved on release of said spider by said other latch member to release said bracket and allow said first latch to move into the path of said dog and said driven arm.

11. A clutch as described in claim 10, wherein said bracket has an arcuate extension coacting with said ear to lock said first latch in latching position while said spider is latched in another position, said ear being moved to unblock said arcuate extension when said spider is released from said other latched position.

12. In a clutch mechanism of the class described, a constantly rotating power member, a rotary load member coaxial therewith, a Geneva arm pivoted to rotate about the axis of said power member and having an open ended radial slot, 9, driving arm rotatable on an axis parallel to the axis of said power member and having a driving element adapted to enter the slot of said Geneva arm, means to rotate said driving arm whereby said driving element will. move said Geneva arm at an accelerating angular velocity to the vicinity of the plane including said parallel axes, a disk fixed to said load member and having a notch, a dog pivoted to said Geneva arm and engaged in the notch of said disk during said accelerating movement, means to stop said driving arm and said Geneva arm at the 'end of said accelerating movement, a cam member loosely mounted on said load member, and connected with said dog 50 as to move the latter out of engagement with said notch when moved in one direction, a spring connected between said member and said Geneva arm tending to move said cam member in the other direction, and a stud fixed to said driving arm and coacting with said cam member to stop the same just prior to the stopping of said driving arm, whereby the final movement of said Geneva arm in relation to the stopped cam causes said dog to be disengaged.

13. A clutch mechanism as in claim 12, further characterized by means to rotate said driving arm farther about its axis whereby said driv ing element will move said Geneva arm at an accelerating angular velocity until said driving element passes said plane including said parallel axes, at which time said Geneva arm will be driven at a decelerating angular velocity, a notch on said notched disk adapted to be engaged by said dog to control the motion of said load member to a home position during said decelerating movement, and means to return said Geneva arm to its home position after said driving element leaves the radial slot of said Geneva arm.

14. In a clutch device of the kind including a continuously rotating drive element having a single notch, a normally stationary driven element coaxial with said drive element having a dog to engage said notch, and latch means normally holding said dog out of engagement with said drive element and said driven element in a predetermined angular position; means to release said driven element and said dog in time to permit said dog to engage said drive element in advance of said notch, and means to accelerate said driven element smoothly from its stationary condition to a speed approximately equal to that of said drive element, by the time said notch reaches said dog, and means to hold said latch means out of the path of said dog and said driven element during the running condition of said driven element.

l5. A clutch device as described in claim 14, including means to return said latch means to position to intercept and latch said dog and said driven element, means to disengage said dog from said notch during the running condition of said driven element at a time when said driven element is approaching its stationary position, and decelerating means to control the movement of said driven element following the disengagement of said dog, said driven element at a predetermined rate to a relatively slow speed at the time it is intercepted by said latch means.

16. A clutch device as described in claim 15, wherein said decelerating means is adapted first to accelerate said driven element to an angular velocity higher than that of said driving element, whereby said dog is made free in said notch at the time it is disengaged therefrom.

ELLIOTT W. GARDINOR. CURT I. JOHNSON. EUGENE J. LAMB.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,049,690 Cunningham Aug. 4, 1936 2,199,561 Fuller et a1 May 7, 1940 2,327,176 Cory Aug. 17, 1943 

